218 SOME CHINESE VERTEBRATES. 
symmetry. It consists of an anterior transverse enamel space, succeeded by 
two small closed triangles, the outer slightly in advance of the inner and more 
sharply angular. Then follows a terminal Y-shaped space whose outer anterior 
lobe is slightly the longer. The tooth has thus 
three external and three internal salient angles. 
No variation from the condition here described is 
shown by any of the six specimens. 
In the first lower molar of the type there are 
four salient angles on either side. The posterior 
enamel space is the usual transverse crescent, an- 
terior to which are two inner and two outer alter- 
nating closed triangles. The anteriormost closed 
space has a small angle on either side at its poste- 
rior end. The second lower molar has but two 
closed triangles and at each end of the tooth a 
transverse closed space, the anterior of which is 
E 
Craseomys aquilus. Type No. 
7189. E, Enamel pattern of left lower molar has the usual three transverse loops, 
upper molars. F, Enamel pattern { . 
Ot righblower Glan! the anteriormost smallest and almost oval in out- 
deeply cut by the first outer reentrant. The third 
line. Like the preceding tooth, it has three ex- 
ternal and three internal salient angles, but the outer reentrants are very much 
shallower than the inner. 
In Nos. 7189 and 7192, the antero-internal notch of the first enamel loop 
of the first lower molar is so well developed that it nearly cuts off a fifth triangle 
while in No. 7191 this reentrant is still deeper and completely cuts off this triangle 
so as to produce two external and three internal closed triangles in addition to 
the anterior loop and the posterior transverse crescent. In this specimen, there- 
fore, there are four external and five internal salient angles. In No. 7194 this 
tooth is as in the type. 
Measurements:— The following measurements were taken in the flesh by 
the collector :— 
Total 
No. Length. Tail. Hind Foot. 
7189 152 57 17 
7190 Type 160 59 20 
7191 144 55 18 
7192 157 55 19 
7194 150 54 17 
7196 145 52 19 
Average 151 55 18 
